Applying a makeup primer prior to the foundation is a must in order to make your makeup stay put on for longer and to look flawless all night long. A good primer will prepare your skin for the makeup application, creating a protective base for longer lasting makeup. Apply the primer after moisturizing your skin and before the foundation. You can apply it over the entire face or only to any shiny areas of the face, usually the nose, chin and forehead. applying a makeup primer works especially well for those with oily or combination skin as it reduces the excess shine by absorbing the excess oil on the skins surface and make any large pores appear smaller and less visible.